Jaeger-LeCoultre Caliber 217 – Technical Overview from Document 1085_JLC

The Jaeger-LeCoultre Caliber 217 is a classic manual-winding mechanical movement distinguished by its reliability and elegant construction. Document 1085_JLC provides a comprehensive technical description, highlighting the movement’s design, features, and servicing recommendations.

Technical Specifications

• Type: Manual-winding

• Functions: Hours, minutes, small seconds

• Jewels: 17

• Frequency: 18,000 vibrations per hour (2.5 Hz)

• Power Reserve: Approximately 40 hours

• Diameter: Approximately 27.0 mm

• Height: Approximately 3.5 mm

Movement Architecture and Features

• Equipped with a small seconds subdial at 6 o’clock, driven by the fourth wheel and pinion

• Features a two-bridge construction providing rigidity and ease of servicing

• Contains a robust gear train and mainspring barrel for smooth power transmission

• Includes shock protection on the balance staff to withstand impacts

• Manual winding and setting mechanisms designed for durability and smooth operation

Servicing Notes

• Accurate lubrication is essential on escapement pivots, pallet fork jewels, and balance staff

• Light grease applied to barrel arbor and winding components reduces wear

• Regulation targets amplitude between 250° and 280°, with beat error maintained below 0.7 ms

• The small seconds mechanism should be checked for smooth operation and proper seating

• Regular maintenance of keyless works ensures reliable winding and setting functions

Applications

• Caliber 217 was used extensively in Jaeger-LeCoultre’s mid-20th-century dress watches

• Found in models with classic aesthetics and small seconds complication

• Typically housed in stainless steel or precious metal cases measuring between 34 and 36 mm

Conclusion

The Jaeger-LeCoultre Caliber 217, as detailed in document 1085_JLC, exemplifies traditional Swiss watchmaking with its precise engineering, reliable performance, and classic design. Its combination of robustness and elegance continues to make it a favored movement among vintage collectors and watchmakers specializing in Jaeger-LeCoultre timepieces.